What type of foam is used in the K Pro Series? Zoe March 02, 2023 02:46 EVA. Related articles Why can't I set the K3 Pro backlight to white? Can the K8 pro type ASCII special characters? Is there a key combination/ shortcut to lock the backlight effect for the K Pro series keyboard? Bluetooth can't connect The V10 works only when plugged in directly to my computers and it does not work when plugged in through my KVM switches.